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Linux.com: Secure Communication with GnuPG on Linux

"GnuPG is a tool for secure communication and data storage. It
can be used to encrypt data and to create digital signatures. GnuPG
is a complete and free replacement for PGP. Because it does not use
the patented IDEA algorithm, it can be used without any
restrictions. GnuPG uses public-key cryptography so that users may
communicate securely. In a public-key system, each user has a pair
of keys consisting of a private key and a public key. A user's
private key is kept secret; it need never be revealed. The public
key may be given to anyone with whom the user wants to
communicate."

"...Anybody who is cautious about security must use GnuPG.
It is one of the best open source software which has all the
functions for encryption and decryption for all your secure data
and can be used without any restrictions as it is under GNU General
Public License. It can be used to send encrypted mail
messages, files and documents for security. It can also be used to
transmit files and important documents through network
securely."